Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C19/00—Alloys based on nickel or cobalt
  • C22C19/03—Alloys based on nickel or cobalt based on nickel
  • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
  • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
  • B23K35/0261—Rods, electrodes or wires
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
  • B23K35/24—Selection of soldering or welding materials proper
  • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
  • B23K35/3033—Ni as the principal constituent
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
  • B23K35/24—Selection of soldering or welding materials proper
  • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
  • B23K35/3033—Ni as the principal constituent
  • B23K35/304—Ni as the principal constituent with Cr as the next major constituent

Definitions

• Ni-based heat resistant alloys having the following compositions in mass % are known as the Ni-based heat resistant alloy that constitutes the various mechanical parts: a Ni-based heat resistant alloy composed of 19.5% of Cr, 13.5% of Co, 4.3% of Mo, 1.4% of Al, 3% of Ti, 0.6% of C, 0.05 % of Zr, 0.006% of B, and a balance of Ni; Ni-based heat resistant alloy composed of 19% of Cr, 11 % of Co, 9.8% of Mo, 1.5% of Al, 3.2% of Ti, 0.09% of C, 0.07 % of B, and a balance of Ni; a Ni-based heat resistant alloy composed of 19% of Cr, 12% of Co, 6% of Mo, 1% of W, 2% of Al, 3% of Ti, 0.03% of C, 0.007% of B, and a balance ofNi; and Ni-based heat resistant alloy composed of 16% of Cr, 8.5% of Co, 1.8% of
• the inventors carried out research so as to solve the above-described problems, and achieved results of the research as described in the following (A) to (D).
• the present invention was carried out based on the above-described research results and has the below-described aspects.
• a wire for welding Ni based heat resistant alloy according to the present invention having the above-described composition and a texture in which M 6 C type carbide and MC type carbide are uniformly dispersed in the matrix can be obtained by the following production method.
• molten alloy is formed by melting Ni-based heat resistant alloy having a composition containing, in mass %, Cr: 14.0 to 21.5%, Co: 6.5 to 14.5%, Mo: 6.5 to 10.0%, W: 1.5 to 3.5%, Al:1.2 to 2.4%, Ti:1.1 to 2.1 %; Fe: 7.0% or less, B: 0.0001 to 0.020%, C: 0.03 to 0.15%, further containing, in mass %, Nb: 0.1 to 1.0% according to need, and a balance consisting of Ni and unavoidable impurities, wherein a content of S and P contained in the unavoidable impurities is controlled to be, in mass%, S: 0.004% or less, and P: 0.010% or less.
• An ingot is obtained from the molten alloy.
• a step of subjecting the thus obtained ingot to repeated hot-working including hot-forging and hot-rolling after heating the ingot to a temperature within a range from ⁇ ' solvus (solvus temperature of ⁇ ' phase) +20°C to ⁇ ' solvus +200°C, working to a desired product region by a working ratio of 15% or more is performed at least two times or more in a temperature range from the heating temperature to ⁇ ' solvus -150°C. Where necessary, the work is subjected to cold working.
• a Co component is mainly solid-solubilized in the matrix ( ⁇ phase) and enhances the creep property, and improves flowability of molten metal by forming MC type carbide.
• Co content is less than 6.5% in mass %, it is not preferable since sufficient creep property cannot be provided.
• the Co content exceeds 14.5% it is not preferable since hot-workability and cold-workability is reduced and high temperature ductility during the use of combustor or the like is deteriorated. Therefore, content of Co was determined to be 6.5 to 14.5% in mass %.
• a more preferable range of Co content is 7.5 to 13.5% in mass %.
• a C component forms M 6 C type and MC type carbides with Ti, Mo and the like and improves flowability of molten metal, thereby improving the welding speed.
• the C content is less than 0.03% in mass %, it is impossible to obtain sufficient flowability of molten metal because of an insufficient precipitation ratio of M 6 C type and MC type carbides.
• the C content exceeds 0.15%, it is not preferable since too excessive amount of carbides are generated, thereby deteriorating hot-workability, cold-workability and weldability. Therefore, the C content was determined to be 0.03 to 0.15% in mass%. A more preferable range of the C content is 0.05 to 0.12% in mass %.
• An ingot is obtained by melting and pouring Ni-based heat resistant alloy comprising a composition containing, in mass %, Cr: 14.0 to 21.5%, Co: 6.5 to 14.5%, Mo: 6.5 to 10.0%, W: 1.5 to 3.5%, Al:1.2 to 2.4%, Ti:1.1 to 2.1%; Fe: 7.0% or less, B: 0.0001 to 0.020%, C: 0.03 to 0.15%, further containing Nb: 0.1 to 1.0% according to need, and a balance consisting of Ni and unavoidable impurities, wherein a content of S and P contained in the unavoidable impurities is controlled, in mass%, S: 0.004% or less, and P: 0.010% or less.
• the M in the M 6 C type carbide has a composition comprising, in mass %, Ni: 12.0 to 45.0%, Cr: 9.0 to 22.0%, Co: 0.5 to 13.5%, W: 2.0 to 24.0%, Al: 5.0% or less, Ti: 0.5 to 6.0%, further containing Nb: 1.0% or less according to need, and a balance consisting of Mo and unavoidable impurities.
• the M in the MC type carbide has a composition comprising, in mass %, Ni: 7.0% or less Cr: 6.0% or less, Co:12.0 % or less, Mo: 57.0% or less, W: 15% or less, Al: 6.0% or less, further containing Nb: 65% or less according to need, and a balance consisting of Ti and unavoidable impurities.
• the thus formed M 6 C type carbide and the MC type carbide each have a effect of improving flowability of molten metal. Therefore, they may be uniformly dispersed in the matrix of the Ni-based heat resistant alloy in any proportion.
• the M 6 C type carbide and the MC type carbide uniformly dispersed in the matrix of the Ni-based heat resistant alloy according to the present invention have an average grain diameter: 0.3 to 4.0 ⁇ m, and that the M 6 C type carbide and the MC type carbide are uniformly dispersed in the matrix at a total proportion of 0.5 to 16.0%.
• the wire for welding according to the present invention may be used in effective welding of various mechanical parts of gas-turbine engine and the like, it is possible to further reduce the cost.
• Ingots each having a diameter of 100 mm and a height of 150 mm were produced by melting Ni-based alloy having a composition shown in Tables 1 to 3 to form molten alloys, and casting the molten alloys.
• Round bars each having a diameter of 20 mm were produced by hot-forging the ingots.
• Inventive wires (wires of the present invention) 1 to 28 and Comparative wires 1 to 18 were produced by cold-drawing the above-described round bars.
• Each round bar had a diameter of 2.4 mm, a composition shown in Tables 1 to 3, and a texture in which M 6 C type carbide and MC type carbide having an average grain diameter shown in Tables 4 to 6 were uniformly dispersed in the matrix in an area ratio shown in Tables 4 to 6.
• Ni-based heat resistant alloy plates having a composition, in mass %, of Cr: 19.5%, Co:13.5%, Mo: 4.3%, Al: 1.4%, Ti: 3%, C: 0.06%, Zr: 0.05%, B: 0.007%, and a balance of Ni, and a plate thickness of 8 mm were prepared.
• Two blank plates were prepared by subjecting the above-described plates to edge preparation of 60°. The blank plates were butted against each other and arrested in that state on an arresting table having a thickness of 15mm such that a Y-shaped groove was formed leaving a minimum spacing of 1 mm.
• inventive wires 1 to 28 generate no weld-metal cracking under the high-speed welding, and provide weld-zones having excellent high-temperature strength compared to Comparative wires 1 to 18, and the Conventional wire.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Arc Welding In General (AREA)

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• 2007
  • 2007-04-09 JP JP2007101375A patent/JP5201708B2/ja active Active
  • 2007-04-16 US US12/296,743 patent/US8187531B2/en active Active
  • 2007-04-16 EP EP07741692.3A patent/EP2008757B1/fr active Active
  • 2007-04-16 CN CN2007800128107A patent/CN101421072B/zh active Active
  • 2007-04-16 WO PCT/JP2007/058256 patent/WO2007119847A1/fr not_active Ceased

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